Continuous process for the purification of zinc plant...

Details Continuous process for the purification of zinc plant... Continuous process for the purification of zinc plant...

C - Chemistry, Metallurgy

25

C

204/74

C25C 1/16 (2006.01) C22B 3/46 (2006.01) C22B 15/00 (2006.01) C25C 7/06 (2006.01)

Patent

CA 1117897

ABSTRACT Continuous process for the purification of zinc plant electrolyte employing copper arsenate for the removal of cobalt and associated impurities in a four-step treatment comprising: (1) cementation of copper with fine zinc dust, (2) precipitation of the major portion of cobalt by the addition of coarse zinc dust, dilute sulfuric acid and copper arsenate, (3) further addition of coarse zinc dust and dilute acid to precipitate more cobalt and reduce the cobalt level in said electrolyte to about 1.0 ppm, and (4) further addition of coarse zinc dust and dilute acid to reduce the cobalt level in said electrolyte to less than about 0.1 ppm.

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